LTC2950-1 Datasheet, PDF (1/16 Pages) Linear Technology – Push Button On/Off Controller

LTC2950-1/LTC2950-2
Push Button On/Off
Controller
FEATURES
■ _{Adjustable Push Button On/Off Timers}
■ _{Low Supply Current: 6μA}
■ _{Wide Operating Voltage Range: 2.7V to 26V}
■ _{EN Output (LTC2950-1) Allows DC/DC Converter}
Control
■ _{EN Output (LTC2950-2) Allows Circuit Breaker}
Control
■ _{Simple Interface Allows Graceful μP Shut Down}
■ _{High Input Voltage PB Pin with Internal Pull Up}
Resistor
■ _{±10kV ESD HBM on PB Input}
■ _{Accurate 0.6V Threshold on KILL Comparator Input}
■ _{8-Pin 3mm × 2mm DFN and ThinSOT}^TM _Packages
APPLICATIONS
■ _{Portable Instrumentation Meters}
■ _{Blade Servers}
■ _{Portable Customer Service PDA}
■ _{Desktop and Notebook Computers}
DESCRIPTION
The LTC^®2950 is a micropower, wide input voltage range,
push button ON/OFF controller. The part contains a push
button input with independently programmable ON and OFF
debounce times that control the toggling of an open drain
enable output. The part also contains a simple micropro-
cessor interface to allow for proper system housekeeping
prior to power down. Under system fault conditions, an
internal KILL timer ensures proper power down.
The LTC2950 operates over a wide 2.7V to 26V input
voltage range to accommodate a wide variety of input
power supplies. Very low quiescent current (6μA typical)
makes the LTC2950 ideally suited for battery powered
applications. Two versions of the part are available to ac-
commodate either positive or negative enable polarities.
The parts are available in either 8-lead 3mm × 2mm DFN
or ThinSOT packages.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT is
a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
TYPICAL APPLICATION
V_IN
3V – 26V
V_IN
V_OUT
DC/DC
BUCK
SHDN
V_IN
EN
LTC2950-1 _INT
PB
KILL
GND ONT
OFFT
C_ONT*
0.033μF
C_OFFT*
0.033μF
R1
10k
INT
μP/μC
KILL
2950 TA01
*OPTIONAL
Turn On Debounce
EN
2V/DIV
PB
10ms/DIV
2950 TA01b
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